Improvement in exhaust-valves



valve.

parte elle.

. WILLIAM A. cAnNS, or MALDEN, MASSACHUSETTS.

Letters Patent noxnocos, data December 13,1870.

IMPROVEMENT IVN .EXHAUST-VALVES.

The Schedule referred to in these Letters Patent and making part of the same.

To all whom. it may concern t Be it known that I, WILLIAM A. Gauss, of Malden, in the county of Middlesex and State of Massachusetts, have invented a new and useful Improvement nExhaust-Valves; -and I do hereby declare that the following is a full, clear, and exact description thereof, which will enable others skilled inthe art to make and use the same, reference being had to the accompanying drawing forming part oi' this specitication.

lhebbject of this invention is to prevent sparks and ciuders from entering or being drawn into the cylinders ofy locomotive-engines when the motionv is reversed; and

It consists in the construction andy arrangement of parts, as hereinafter more fully described.

In the accompanying drawing- Figure l represents a-vertical central section of the improvement.

vFigure 2 is a horizontal section of grl, taken on the line x x. v

Similar letters of reference indicate corresponding parts.-

AV is the exhaust-chamber.

B is the cap.

C is the exhaust-nozzle, through which the exhaust steam is discharged into the smoke-box for increasing the draught.

D and E are exhaust-pipes from the separate engines, which discharge the steam into the chamber A. F is a valve, which is att-ached to the tube Gl The tube G has a conical end orcap H, l

The tube lworks on the spindle I, which is screwed or fastened into the base-block J.

K' is a fan-wheel on the valve-tube G, .and

L is the fan-chamber. l

The wall` of this chamber forms the scat for the Then the engines are running the pressure Vol' the exhaust' steam keeps the valve closed, which Steam is discharged into the smoke-box. W'hen the motion of the engine is reversed, a current of' heated air carrying sparks'aud ciuders, as exhaust-pipes are ordinarily arranged, rushes into the nozzle and into the cylinders through the exhaust-pipes,.to till-the vacuum caused by the reverse motion of the pistons. This isv serves to raise the valve and carry the cone H into the lower end of thc nozzle, thus effectnally closing the nozzle, while a full supply of pure air enter-s the exhaust-chanibor through the screen M.

The lower portion ot' the ian-chamber 1s in coinmunication with the atmosphere, but is covered by the screen so as to exclude dust.

The space N around the fan-chamber receives the water of condensation and is left for drainage.

The valve is kept in position when closed bythe spindle I, the end of which enters the concave of the cone H.

The action of the upward current of air upon the fan-wheel K, when a vacuum is formed in the exhaustcharnber, renders the valve more sensitive and causes `it to operate more freely.

As the valve is arranged, an opening is made so very large, and the action of the valve is so sudden, that the vacuum is not felt by the exhaust-nozzle, and .no sparks or cinders are drawn through it.

By this improvement a fruitfulsoulce oi' trouble in locomotive-engines is avoided, and its advantages must be obvious to all who are acquainted with the subject.

Having thus described my invention,

I claim as new and desire to secure .by Letters Patentl. The arrangement of the valve Fbn the tube G, supported and guided by the spindle I, and operating in the chamber A, substantially as and for the purposes described.

2. The cone H ou thevalve-tnbe G, by means' of' vwhich the exhaust-nozzle is closed as the valve rises, substantially as and i'or the purposes described.

lWILLIAM A. 'CARNS Witnesses HENRY POWELL, A. E, PENNIMAN. 

